Typical symptom of the bowl fill not being correct. There isn't enough water in the bowl the first time so it doesn't flush fully (or empty fully). That flush leaves behind some water, so it is now full. Then, flush it again, and all's well. Either the hose to refill the bowl is misplaced, kinked, or you don't have the OEM fill valve, or have it adjusted properly.

Typical symptom of the bowl fill not being correct. There isn't enough water in the bowl the first time so it doesn't flush fully (or empty fully). That flush leaves behind some water, so it is now full. Then, flush it again, and all's well. Either the hose to refill the bowl is misplaced, kinked, or you don't have the OEM fill valve, or have it adjusted properly.

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Thanks Jad,

Your explanation may line up with the fact that the water in the bowl gurgles at times. Perhaps the water is being pulled out of the toilet bowl. Not sure how...............